Title:
SELF-THREADING FEMALE FASTENER ELEMENTS AND METHOD OF FORMING SAME
Document Type and Number:
WIPO Patent Application WO2004053343
Kind Code:
A3
Abstract:
A female fastener (20) having a self-threading bore (22) for threaded receipt of a conventional male threaded fastener which forms a substantially continuous female thread without tapping having a prevailing torque. The bore includes a cylindrical internal surface (32) and a plurality of circumferentially spaced concave recesses (34) having a total volume equal to an annulus defined by a major diameter and an inner diameter of the cylindrical surface less the volume of the recesses. A method of forming self-attacking fasteners by rolling a continuous metal strip having a central pilot, piercing spaced self-threading bores through the pilot and either severing the pilot or the strip and the individual fasteners may be connected by a frangible connector.
Inventors:
LADOUCEUR HAROLD A (US)
Application Number:
PCT/US2003/037534
Publication Date:
March 17, 2005
Filing Date:
November 24, 2003
Export Citation:
Assignee:
FABRISTEEL PROD INC (US)
LADOUCEUR HAROLD A (US)
LADOUCEUR HAROLD A (US)
International Classes:
B21K1/66; B21K1/68; B21K1/70; B23G1/16; F16B27/00; F16B37/00; F16B; (IPC1-7): F16B37/00; B21K1/66
Foreign References:
US5139380A | 1992-08-18 | |||
US6540462B1 | 2003-04-01 | |||
US3775791A | 1973-12-04 |
Other References:
See also references of EP 1576296A4
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